Manufacture of pressed glassware



(No Modeil) J. DENNING.

Manufabt-ure 0f Pressed Glassware.

Patented July 27,1880.

v I y w d l ornys.

I ".PETERS, FHOTO-LITHOGRAPHER. WASHINGYON, D. C

ATENT Fries,

JAMES DENNING, OF PITTSBURG, PENNSYLVANIA.

MANUFACTURE OF PRESSED GLASSWARE.

SPECIFICATION forming part of Letters Application filed May To allwhomit may concern:

Be it known that 1, JAMES DENNING, of Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented certain new anduseful Improvementsin the ll'lanufacture of Pressed Glassware; and Ihereby declare the followin g to be a full, clear, and exact descriptionof the same, reference being made to the accompanying drawings, inwhich- Figure l is a transverse vertical section of a glass-press withmy attachments. Fig. 2 is a front view of same.

In the manufacture of pressed glassware, such as goblets, tumblers,jellies, &0., the article is formed by forcing a plunger into a moldinto which has been-previously dropped a lump of molten glass. Theentrance of the plunger then forces the soft glass into the interiorshape figured by it and the mold; but the operation being repeated atquick intervals, it has been found necessary to adopt some means forpreventing the plunger from becoming too hot at its lower end, becauseif too hot it sticks to the glass and destroys the tinish of the articlein the withdrawal. The most successful means hitherto found, and the onenow in general use, is a blast of air directed upon the plunger; but itis directed indiscriminately upon the whole plunger. The result of thisis, that the whole plunger is kept cool, and its upper part is held at atemperature insuflicient for the proper working of the glass, which atthat point is very thin and easily chilled, and in consequence thefinished article presents a wavy or crizzled appearance at its upperportion.

h'ly invention,then,consists in so governing the air-blast by suitablemeans that itwill strike only upon the lower part of the plunger,keeping it cool, but preventing the current from impinging upon theupper part of the plunger, thus allowing it to store up suflicient heatto prevent crizzlin g.

It consists, further, in the specific means I adopt to effect the aboveobject, substantially as hereinafter fully described and claimed.

1n the drawings, A designates a press-table of the ordinary form; B, themovable mold; O, the plunger fixed to the rod 1); E F, the lower andupper spring-plates, respectively; a, the spring-rods; b, the springs; cc, the

Patent No. 230,534, dated July 2'7, 1880.

21,1880. (No model.)

guide-posts or uprights, and Gr the blast-pipe. All these are as usual,and as such need no further description, being well understood by thoseskilled in glass-pressin With this construction it can be easily seenthat the blast is unimpeded in all positions of the plunger. In itsdescent the blast strikes it under the spring plate E, and when thespring-plate E reaches the mold then the blast strikes the upper part ofthe plunger, as before stated.

l attach to the spring-plate E a holder, H, carrying a screen ordeflector, I, as shown, whose lower edge extends a short distance belowthe springplate, and whose upper edge extends some distance above thetop of the plunger, as shown in the drawings. The deflector l is made ofsheet-iron, preferably, but may be of any form or material, and may belocated variably. according to the construction of the press. In somepresses it may be found sutlicient to have it above the spring-plate E,and not extending below it at all.

Arranged as in the drawings, it will be seen that when the plunger is inits highest. position the blast can pass straight to the lower part ofthe plunger and cool it without touching the upper portion directly atall. As the plunger descends the screen I descends with it, and when theplunger has gone a slight distance into the mold the screen I hasreached the level of the top of the mold, thus cutting off the airentirely from the plunger. This allows the upper part of the plunger toretain its proper heat, while the lower part is kept cool.

lt is obvious that several different modes of reaching the same objectmight be adopted without departing from the scope of my invention.

1 consider as embraced within my invention the following: an annular orsegmental wall placed on the spring-plate, so as to shield the upperpart of the plunger, made of any material capable of serving as a screenor deflector, either above the spring-plate alone orabove and below it;or the nozzle might beattached to the spring plate E or any of the'movable parts of the press, and so adjusted as to be carried up and downwith the springplate E while blowing across under it. Thus facture ofpressed glassware, wherein a blast the blast would strike the plungerbelow but I when the spring-plate E would reach the mold the blast wouldbe shut off from the plunger entirely; or the blast-pipe might have avalve, which could be arranged to shut during the descent of theplunger.

I therefore wish to be distinctly understood, as not limiting myself toany particular arrangement or construction, as my invention embraces anymeans whereby the air-blast is so governed as to impinge only uponthelower part of the plunger.

What I do claim is 1. The described improvement in the manuof air isused to cool the plunger of a glasspress, consisting in confining, bysuitable means, the blast otairto the lower part of the plunger anddirecting .it against the external su: t'ace thereof, substantially asdescribed.

2. In glass-presses, a'screcn or deflector placed between the air-nozzleand the upper part oi the plunger, substantially as described.

3. The combination of the mold B, plunger (J, springplate E with theholder H, and screen 1, attached to the spring-plate E, and between itand the blast-pipe G, substantially as described.

In testimony whereof I have hereto set my hand.

JAMES DENNING. W i tnesse:

'1. J. MOTIGIIE, JOHN E. DUFFY.

